Power drag or falling saw



April 12 1927. 1,624,662-

` F. HALVORSEN POWER DRAG OR FALLING SAW Filed Oct. Q 1922 5 $heets-Sheet 1 Fredrik' Halvorse April 1,2, 1927.

I 5 Sheets-Sheet 2 F. HALVORSEN POWER DRAG OR FALLING SAW Filed Oct. 9 1922 l l l l l llrlllllnllllAI-J 1,624,662 F. HALvoRsr-:N l

POWER DRAG OR FALLING sAw Filed Oct. 9, 1922 5 Sheets-Sheet 5 April 12, 1927.

[I limunnnuunnmnunuu Fredrik Hah/0725er;

@www W April 1.2', v1927.

1,6245662' F. HALVORSAEN.

POWER DRAG OR FALLING SAIW Filed Oct. '9. wie 5 sheets-sheet 5 I//\- y, f/ Fredrik 'Hahronse YPatented Apr. 12, 1,927.

'UNITED STAES POWER DRAG oa v:annullate SAW.

,Application mea amber 9, 1922.k :se'rjial'na 593,253.

inventionrelates to powerf driven saws and has lfor its general object the provision of a ver. light, lportable saw of this characterwhic .canbe transported throughheavily` t ythis supporting-means shown 1n Flgurej,

wooded Vand. mountainousl areas, to be used either for falling trees -or .for bucking, or cutting up, down timber into suitable lengths.

' Aside from the general object, my principal object is to provide asimple, cheap and reliable, and light means for changing .rotary motion ofthe motor into reciprocating l i motion .ofthe saw.

A `further object is toy :provide means whereby the stroke .of the saw may be gradually increased `inspeed at the beginning of .feach'vstfrokev y 4 A further object is the provision of means anda mounting` of the sawwhereby the saw andits 'operating means exert the only ,pressure needed in bucking a'log. Y y Y A- further object is *the* provision of a novel supporting means Jorsuch -a power fdrivensaw whichwill 'enable'itto be sup- 'ported in variousfpositions,:partly from the ground and partly from the log tolbe sawn, 'or wholly from 'the log or tree `to be sawn,

` whereby-it may be used in positions other- 'wise cliiicult of "accessy .A further object is the provision of a sup-v portingmeans whereby the saw may be used for sawing 'out' an undercut in `it'alling trees.

Other objects, and lobjects relating to stazuctural details, may be ascertained Vfrom a 'study of the attached drawings and the following specification', whereinv my invention is shown and described in its Vpresent preferred form, yand as embodied in ,a-buc'king saw.

My invention comprises those novel parts* 'and combinations 'thereof which are shown "in the accompanying drawings, de'scribedjn the specilication, and particularly defined by the claims terminating `the same.

,.Figure 1 is a plan View and Figure 2 a lside elevation of my saw .employed in bucking @110e VFigure 3 is afplanview and --Figure 4a side elevation of the operative connecting 'means between the'motor` and saw. i

Figure '5 is an endfview Vof the saw tilted at an angle Ato avoid an obstacle, showing a means 'for supporting the device wholly from the log to be sawn.

'Fi'gure t6 "is a transverse section through the supporting trame 4and the frame-which supports the operating means, showing v the releasable vsupporting connection 'therebetween. Y y Y Figure 7 1s a plan view of .a portion of The `principal* parts of my Vinvention com- Y prise ya support 10 upon which amotor 1 vvof any suitable type is supported,"together with such tanks asUv the gasoline supply ktank `11 and the water -tank or radiator 12, a saw .2

of anysuita'ble design, and Ameans for `communicating the rotary movement of the live shaft 13 into reciprocating `movement of the saw2.'

The exact construction ofthe frame 10 is relatively unimportant. V It should Ibe :light sovthat'it is easily Iportable and should `have means for securing it to a `tree or log which ris =to be sawn. `I haves'hown dogs 14r which PATENT QFFJCE. l L

'may be driven into a log to Ysupport one end `of lthe ltrame 10 thereon. rlfhis is suitable for .a drag vsaw or bucking saw, but other means-:may be provided when the saw is used for falling. The opposite end ofthe frame in bucking, is usually intended to rest upon Vthe ground. They motor likewise V4is loffany vsuitable design, and to enable it to 'function properly in various positions may employ Aan injector lor aV flexiblyrv connected carburetor. vAs such expedients are wellf'known 5in the motorfart, they lrequire no dektailed explanation here; It is only essential `to state that in addition fto' being vcapable of use in various positions, Ythe motor mustfbe one which is sulic'iently powerful and yet which may gbe'transpo-rted withouty -gr'eat diliculty .A clutch enclosed within 'the ycasing 15 and controlled by a handle lcontrols the application of power to the'fshaftl.

A frame 3 is supported 'from the support A10 4preferably in such mannerfthat vit is -pivoted coaxially with the shaft 13. I have shownl an armsecured to the frame 3 and terminating ina bearing 30, one 'half 'of which lis shown. This ,bearingy receives .a sleeve V17 enclosingthe shaft 173. The trame thereof, is an end of the sawv 2. The outer end of the saw may be supported directly from the frame 3, and for this purposel have shown an antifriction roller r32 sup ported in a projecting arm 33 carried by the frame 3. The roller 32 is intended to be received in a slot 23 in the saw 2. The saw 2 and frame 3 are thus held rigid except for relative reciprocating .movement Y 'l he Vsaw may be quickly removed from the frame, and the frame from the support l0, to transport the device.

Theouter periphery of the frame 3, as indicated at 35, is formed as a guide for a chainu. The chain preferably does not rest directly upon the periiheral guide but issupported therefrom by means of laterally projecting guide rollers 51, two such rollers being shown as journaled in arms which are secured to the chain. A link 54 is secured to the chain 5 at a. point between the two arms 5()y and connects the chain with the pivot pin 41 of the cross head 4. The link 54 and arms 50 are shown herein as formed in one piece. At the ends the chain guide 35 terminates in cams 36 fo-rmed somewhat as a cycloid. The purpose of this will be apparent hereafter.

Means are provided on the frame 3 for supporting and drivingvthe chain 5n At the ends of the frame 3 I ournal three sprockets 6, these being arranged in a triangle and serving to guide the chain 5 about the ends of the frame l3. Means are provided for driving Vat least one ofthese sets of sprockets 6, although it may be necessary at times to drive both sets of sprockets, as has been shown in Figure-3. This, however, is a matter of choice and is determined by the conditions under which the saw is to be Yoperated. I have illustrated three gears corresponding each to itsV respective sprocket 6 and journaled in the frame 3. A central gear 61 is in mesh with all'tliree of the gears'60 and is operatively connected to the live shaft 13 upon which it is shown as securedv ln cases where it is desired to drive the sprockets at both ends of theV frame, a bevel gear 62 may also be secured upon the shaft 13, this meshing with a bevel gear 63 upon a longitudinal shaft 64, this shaft being connected through bevelA gears 65 and 66 to the central gear 61 at the opposite end of the frame.

I have shown yieldable means connecting the saw 2 and the pin 41 of the crosshead 4. Thesemeans comprise. a pin 24, a casing 25 itting thereabout, and a Yspring 2G interposed between the pin 24 and casing 25, and yieldable in each direction. The casing 25 is removably connected to the saw 27 and the proaches an end of its stroke the link of the y chain to which it is connected rides upon the guide 36. This cam guide is so formed that the speedl of the crosshead is gradually decreased towards the end of its stroke and gradually increased atthe beginning of its stroke. 'il his is best illustrated by the dotand-dash lines 7, 71, 72 and 73 in Figure 4, representing successive positions of a median line through link 54. By reason of this arrangement the stroke of the saw is notlbegun at maximum speeds and the saw is given an opportunity to begin cutting through the wood gradually, rather than being started with a jerk. ln case, it encounters. an obstruction the spring 26 will prevent injury to the saw or the drive mechanism therefor.

rlhe arms 50 in addition to guiding the chain, prevent twisting of the link 54 relative to itsnormal position at right angles to the general direction of the chain 5.

reterably also l provide means whereby the frame 3 is supported from the support 10 to the end that the saw when it cuts through a log will not fall upon the ground but may be held therefrom. lt is also convenient at this point to insert a feed-controlling device,

this being especially useful in undercutting. l have shown a lugV 37 secured upon the frame and adapted to receive a ring 38 forn'iing the lower end ofthe screw 38. The

screw 38 is removably secured to the frame 10 and for this purposel have shown a split lor bifurcated bracket 13 secured to the fra-me 10 and adapted to receive a nut 39 threaded upon the screw 33. By slightly raising the screw 3S and nut 39 Vand moving it tol one side, it. can be released rfrom the bracket 1S. For this purpose I have provided a handle 39 upon the screw.

At times it may be desirable to elevate the rear end ot the frame 10 and to permit this l -have illustrated the ground end or that end which is normally resting upon the ground as pivoted upon the remainder 'of the frame so that the portion 10 may Vbe ,i

bent at an angle to the main frame 10 tor form a supporting leg. Means are showirat 19for clamping the two parts in relative'adjusted position.

It may also port the entire frame 10 from the log which is to be sawn, rather than from the log and be desirable at timesto suptive angularly adjusted position.

the ground. Such a construction is shown in Figure 5. Herein the dogs 14 are provided withratchet teeth 8 with *which` are engaged dogs 80 mounted on the frame 10. By driving in the dogs 14 and engaging the ratchet dog-s 80 with the teeth 8 thereof, the dogs being held firmly in the log, will permit the support of the frame solely from the dogs and therefore from the log which is to be ysawn. Such a support is adapted especially to use in positions wherein the stroke of the saw would normally be obstructed by a llog or boulder on the far side of the log or where there is no suitable support for the 'ground end of the frame 10. y

My device may also be employed -for falling. Suchv use and the constructions enabling it are shown in lFigures 9, 10 and 11. In this form the support franie 9 is provided with dogs 14 which secure it to the trunk of the tree which is to be felled. ing screws 90 may be employed in connection with the frame 9 to provide a three or four-point bearing'surface upon the tree. The frame 9 is provided with a pivot trunnion 91 upon which is pivoted as a whole the engine 1, the framev 3 and saw 2 connected thereto, and a table 92 which acts as a support for the frame 3 and saw 2. Some suitable means are provided for fixing the table 92 and the supporting frame9 in rela- Such means have been illustrated in' Figure 11 and comprise a pinion 93 secured upon the shaft 91, an arm 94 pivoted upon the table 92 or its support and engageable at one end with the pinion 9 by similarly shaped teeth. Its other end is Controlled yin position by a control lever 95 acting upon a cam surface 96 of the lever 94. The positions of this arm 94 are shown in full lines and in dotted n lo a slight degree, thus affording some give f lines respectively. Obviously any other suitable means may be employed for thisy purpose.

I have shown alsoa section 14" between lhe ends of the dogs 14 which is resilient d between the support 9 and the saw 2. The

site side of the tree and a horizontal kerf is cut until vthe tree is felled.

lVhat I claim as my invention is: 1. In combination, a motor, a reciprocable saw, a'reciprocable crosshead and a guide therefor, said saw being connected to said crosshead, a chain operatively connected to Adjust-l 2. In av power saw-operating mechanism,

in'coinbinat-ion with a reciprocable crosshead anda motor for operating the same,

an endless chain means, including sprockets and peripheral guides at'theend of the chain run for supporting and guiding said chain, means for driving said chain from said motor, a crosshead guide` extending` from the guide sprocket at one end ofthe chains' run towards the sprocket at the opposite end of its run and along the line eonf iiecting the axis of said sprockets, the said crosshead being reciprocable with said guide, a link secured in said chain and pivoting upon the crosshead, said link having lateral arms extending substantially parallel to a straight run of the chain and having guiding engagement with said peripherall Y guide.

3. In combination, a motor, a reciprocable saw, a frame, a crosshead guide carried by said frame, a second guide formed about Y the periphery of said frame, a crosshead connected to said saw and reciprocable in said crosshead guide, a chain guided by said peripheral guide, three sprocket wheels positioned in a triangle at each end of the frame to guide the chain thereabout, and means for driving said sprockets from the motor.

4. In combination, a motor, a reciprocable i saw, means operatively connecting the motor and saw including a crosshead rrec'ipro-; cable from the motor, a pin carried by said crosshead, a telescoping arm pivoted by one end thereon, and secured at its other end to,

the saw, and a spring interposed between ythe relatively movable parts' of the said arm. 5. In combination, a motor, a support therefor, a reciprocablev saw, a frame pivo-1 tally supported coaxially of the motor shaft, a gear carried b-y the motor shaft, three gears journaled in an end of said frame and arranged in a triangle about and meshing with said iirst gear, three sprockets carried by the frame and corresponding to the three gears, and rotated thereby, a chain carried by said sprockets, means for .guiding saidv chain about the opposite end of said frame, a crosshead and a guide therefor carried by the frame, said crosshead being connected to said saw, and means connecting the chain and crosshead to reciprocate the latter.

Signed at Seattle, King County, Washington, this 3rd day of October, 1922.

. FREDRIK HALVORSEN.V

ioo

iio 

